561915 has 12 divisors (see below), whose sum is σ = 974064. Its totient is φ = 299664.

The previous prime is 561907. The next prime is 561917. The reversal of 561915 is 519165.

561915 = T₁₅ + T₁₆ + ... + T₁₄₉.

It is not a de Polignac number, because 561915 - 2³ = 561907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6199 + ... + 6288.

It is an arithmetic number, because the mean of its divisors is an integer number (81172).

2⁵⁶¹⁹¹⁵ is an apocalyptic number.

561915 is a deficient number, since it is larger than the sum of its proper divisors (412149).

561915 is a wasteful number, since it uses less digits than its factorization.

561915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12498 (or 12495 counting only the distinct ones).

The product of its digits is 1350, while the sum is 27.

The square root of 561915 is about 749.6098985472. The cubic root of 561915 is about 82.5195545933.

It can be divided in two parts, 561 and 915, that multiplied together give a palindrome (513315).

The spelling of 561915 in words is "five hundred sixty-one thousand, nine hundred fifteen".